noun

• A male deer, especially the male of the red deer after his fifth year.
• An English surname transferred from the nickname, originally a nickname from Middle English hert (“stag, hart”).
• A surname from Irish anglicised from the Irish Ó hAirt (“descendant of a person named Bear or Champion”) (see Old Irish art (“bear”))
• A village and civil parish in Hartlepool borough, County Durham, England (OS grid ref NZ4735).
• A local government district in northeastern Hampshire, England.
• A city, the county seat of Oceana County, Michigan, United States.
• A number of townships in the United States, listed under Hart Township.
• Obsolete spelling of heart [(anatomy) A muscular organ that pumps blood through the body, traditionally thought to be the seat of emotion.]
• Initialism of hazardous area response team.